docs: fix a typo in formatdomain.html
docs: fix a typo in formatdomain.html

Signed-off-by: Chen Fan <12d549d2a7ab71d88ff3fc5139832541597eadf9@cn.fujitsu.com>
Signed-off-by: Jiri Denemark <62bdf77dc47919a4d59a91822129d14633cfca81@redhat.com>

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